3-62
Performance Tests
External Clock/Data Reference Inputs & Clock Reference Output
16 Check that the Display reads NO TROUBLE and all the
Alarm LEDS are off. Press to halt the measurement.
17 Disconnect the PDH/DSn Test Set, 75Ω 2 Mb/s PDH Output from the
75Ω 2M REF IN Port.
18 Connect the PDH/DSn Test Set, 120Ω 2 Mb/s PDH Output to the
120Ω 2M REF IN Port.
19 Change the PDH O/P termination to 120Ω on the PDH/DSn Test Set
and the HP 37718A/19A.
20 Press then on the HP 37718A/
19A.
21 Check that the Display reads NO TROUBLE and all the
Alarm LEDS are off. Press to halt the measurement.
STM-1/STS-3 Receive Data
22 Disconnect the PDH/DSn Test Set Data Output from the HP 37718A/
19A, 120Ω 2M REF IN port.
23 Disconnect the 52/155 Mb/s DATA OUT port from the 52/155 Mb/s
DATA IN port
24 Select CLOCK SYNC [STM-1/STS-3 RECEIVE] ON THE HP 37718A/
19A display.
25 The SDH Clock Loss Alarm led should be lit on the HP 37718A/19A.
26 Set the Synthesizer frequency to 77.760MHz and amplitude to
+10dBm.
27 Connect the Synthesizer to the 75Ω 52/155 Mb/s DATA IN port.
28 Ensure that the SDH/SONET Clock Loss Alarm Led is not lit.
NOTE As the signal is unframed the LOF/OOF etc. alarms will be on.
10 MHz Reference
29 Select CLOCK SYNC [10MHz REF] ON THE HP 37718A/19A
display.
30 The SDH/SONET Clock Loss Alarm led should be lit on the HP
37718A/19A.
31 Set the Synthesizer frequency to 10.000MHz and amplitude to
+10dBm.
RESULTS
RUN/STOP
RESULTS
TROUBLE SCAN
RUN/STOP
RESULTS
RUN/STOP
TRANSMIT
TRANSMIT
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